/*
 * Copyright (C) 2015 Square, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.wrmsr.wava.java.poet;

import javax.lang.model.element.TypeParameterElement;
import javax.lang.model.type.ArrayType;

import java.io.IOException;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import static com.google.common.base.Preconditions.checkNotNull;

public final class ArrayTypeName
        extends TypeName
{
    public final TypeName componentType;

    private ArrayTypeName(TypeName componentType)
    {
        this(componentType, new ArrayList<AnnotationSpec>());
    }

    private ArrayTypeName(TypeName componentType, List<AnnotationSpec> annotations)
    {
        super(annotations);
        this.componentType = checkNotNull(componentType, "rawType == null");
    }

    /**
     * Returns an array type whose elements are all instances of {@code componentType}.
     */
    public static ArrayTypeName of(TypeName componentType)
    {
        return new ArrayTypeName(componentType);
    }

    /**
     * Returns an array type whose elements are all instances of {@code componentType}.
     */
    public static ArrayTypeName of(Type componentType)
    {
        return of(TypeName.get(componentType));
    }

    /**
     * Returns an array type equivalent to {@code mirror}.
     */
    public static ArrayTypeName get(ArrayType mirror)
    {
        return get(mirror, new LinkedHashMap<TypeParameterElement, TypeVariableName>());
    }

    static ArrayTypeName get(
            ArrayType mirror, Map<TypeParameterElement, TypeVariableName> typeVariables)
    {
        return new ArrayTypeName(get(mirror.getComponentType(), typeVariables));
    }

    /**
     * Returns an array type equivalent to {@code type}.
     */
    public static ArrayTypeName get(GenericArrayType type)
    {
        return get(type, new LinkedHashMap<Type, TypeVariableName>());
    }

    static ArrayTypeName get(GenericArrayType type, Map<Type, TypeVariableName> map)
    {
        return ArrayTypeName.of(get(type.getGenericComponentType(), map));
    }

    @Override
    public ArrayTypeName annotated(List<AnnotationSpec> annotations)
    {
        return new ArrayTypeName(componentType, concatAnnotations(annotations));
    }

    @Override
    public TypeName withoutAnnotations()
    {
        return new ArrayTypeName(componentType);
    }

    @Override
    public CodeWriter emit(CodeWriter out)
            throws IOException
    {
        return out.emit("$T[]", componentType);
    }
}
